Frontier Thunder Fire Air Force Airman 1st Class Jermalie Rosario fires an M320 grenade launcher module at Camp Guernsey, Wyo., Aug. 29, 2023, during Operation Frontier Thunder, a readiness exercise. SHARE IMAGE: Download Image: Full Size (0.45 MB) Tags: Air Force, Training, Operation Frontier Thunder Photo By: Air Force Airman 1st Class Kyle Wilson VIRIN: 230829-F-VB725-1012C.JPG Photo Gallery